Texas Tech Scientists Help Protect Precious Playas
March 18, 2008
Texas Tech wetland ecologists propose new wetland management district to defend valuable
but threatened West Texas ecosystems.
A proposal by Texas Tech University researchers for a wetland management district
to protect playa lakes is awaiting approval from the U. S. Fish and Wildlife Service.
In addition, Texas Tech has developed an education model and curricula to incorporate
information about playas into elementary and junior high classes.
These moves by university ecology scientists are intended to help clarify the big
environmental picture about protecting playas – those small, round depressions dotting
the West Texas landscape that remain dry throughout much of the year and emerge as
recognizable wetlands only filled with rainwater
"If things continue and no changes are made from both a legal and an ethical point
of view, we’re going to have a collapse in the playa system relatively soon," said
David Haukos, an adjunct wildlife ecology professor in Texas Tech University’s Department
of Natural Resources Management. "If that happens, then we’ll have unforeseen impacts
on society both in terms of water quality and quantity, but also on wildlife and plants
in this area."
There are plenty of playas on the Texas High Plains and in Eastern New Mexico – approximately
22,000. In fact, it’s the largest concentration in the world. Playas act as natural
water storage sites, providing irrigation water and seasonally recharging the Ogallala,
the nation’s largest aquifer. The 800-mile aquifer stretches from Texas to South Dakota.
Estimates suggest that some 2 million waterfowl winter on High Plains playas, making
it the second largest wintering site in interior North America for ducks and geese.
Wildlife supported by playa habitats has spawned a thriving lease-hunting industry,
as well as being a popular attraction for money-spending birdwatchers and nature photographers.
Across the globe, playas are gaining recognition as valuable ecosystems, Haukos said.
But unfortunately at the local level they’re too often considered unattractive nuisances
or wastelands. The problem for landowners is that they’re not permanently one way
or the other; full or empty.
In their typical annual cycle, playas experience periodic flooding and drying. And
while these water level fluctuations promote nutrient cycling and biological productivity,
the researchers note that landowners frequently prefer less change.
"We need to preserve that process of wetting and drying," said Haukos, who also serves
as a migratory bird specialist with the U.S. Fish and Wildlife Service. "If we make
a playa area wet or dry all the time, then we’ve killed it."
Individually playas are also threatened by potential fertilizer and pesticide runoff,
as well as contaminated water from oil fields or waste matter from livestock operations.
However, the common threat is sedimentation from erosion of cultivated watersheds
surrounding playas. Sedimentation fills playas, which reduces the volume and duration
that water can be held in each playa.
Contact: David Haukos, adjunct assistant professor of wildlife ecology, Department
of Natural Resources Management, (806) 742-1983 or email@example.com.